Yes, he ordered a sizing reamer from PT&G off my custom reamer blueprint. I do not remember the brand of the die blank, but I can ask him if you want me to. It should be here any day now from nitriding. Mine is a .338 NMI, and he will use a Forster .338 WM seating die and my custom chamber reamer to modify it. I, too, like the Whidden dies, which was my original plan until my gunsmith offered the option, but as you noted, the price and turnaround time have significantly increased. Since a friend is also building the same chambering; it is a better route for us.
I do not know their current delivery times, but another source for custom dies is
https://newlonprecision.com/. They also carry blank dies.
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Ed